脑梗死后最早显示典型CT图像的时间为()

A．病后即示高密度病灶

B．病后24～48小时后示高密度病灶

C．病后即示低密度病灶

D．病后24～48小时示低密度病灶

E．病后2～3周示低密度病灶

You （） the project by now.

A. are supposed to finish

B. supposed to finish

C. are supposed finishing

D. are supposed to have finished